RCE in Semcms
CVE-2026-96739
A flaw has been found in SEMCMS up to 4.2. Affected by this issue is some unknown functionality of the file /Edit/php/upload_json.php of the component KindEditor Upload Interface. This manipulation of the argument imgFile causes cross site scripting. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Semcms — versions 4.0, 4.1, 4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/409004 (technical-description, vdb-entry)
- vuldb.com/vuln/409004/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-96739 (third-party-advisory)
- vuldb.com/submit/904124 (third-party-advisory)
- github.com/CSDVi/cve/issues/7 (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2026-96739?
- CVE-2026-96739 is a medium-severity vulnerability in Semcms, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-09-24.
- How severe is CVE-2026-96739?
- Medium severity. CVSS v3 base score is 4.3 out of 10.